One person was injured on the fifth day of the running of the bulls at Spain's San Fermin festival in what was otherwise a fast, clean sprint.

One bull took off like lightning, knocking runners over, as the pack of six fighting animals - and six steers meant to keep them together - left the corral and rumbled through the old quarter of Pamplona.

Spanish Red Cross spokesman Jose Aldaba said one person was taken to hospital with an injury to the right leg which was suffered in a fall. Navarra Hospital said two people are still undergoing treatment to injuries from earlier runs, as well as a young man who fell from a monument during an opening-day party.